Title | A 225 GHz Circular Polarization Waveguide Duplexer Based on a Septum Orthomode Transducer Polarizer |
Publication Type | Journal Article |
Year of Publication | 2013 |
Authors | Leal-Sevillano, C. A., K. B. Cooper, J. A. Ruiz-Cruz, J. R. Montejo-Garai, and J. M. Rebollar |
Journal | IEEE Transactions on Terahertz Science and Technology |
Volume | 3 |
Pagination | 574-583 |
Date Published | Sep. |
ISSN | 2156-342X |
Keywords | Circular polarization, duplexer, orthomode transducer, terahertz |
Abstract | In this paper, we present the modeling and experimental validation of an efficient, compact, and high-isolation waveguide duplexer operating at 225 GHz. While duplexers based on ferrite circulators are key components of many monostatic radar systems, at W-band frequencies and above the performance of waveguide circulators rapidly deteriorates. The design presented here uses a ferrite-free duplexing concept based on transmitting and receiving in orthogonal circular polarizations. The circular polarization is efficiently generated in waveguide using a septum orthomode transducer polarizer, leading to a compact device with a single horn antenna. The complete duplexer is designed using efficient numerical algorithms, resulting in a fabricated device with a measured 10% fractional bandwidth, a return loss better than 20 dB, isolation of 30 dB, and insertion loss below 1 dB. |
URL | http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6525512 |
DOI | 10.1109/TTHZ.2013.2264317 |